React Preparation Pack
Master functional components, hooks lifecycle, reconciliation, virtual DOM internals, and state synchronization.
Question Cards
What is the Virtual DOM in React?
What are React Hooks?
What is useEffect and when should you use it?
What is the difference between useMemo and useCallback?
Explain the difference between useEffect hooks and useLayoutEffect hooks.
What is the Virtual DOM and how does React use it to render pages?
What is React Context API?
How does React Reconciliation work?
What is the difference between State and Props in React?
What is JSX and why is it used in React?
What is the difference between Functional Components and Class Components?
Why are keys important when rendering lists in React?
What is useRef and when should you use it?
What is the difference between Controlled and Uncontrolled Components?
What is React Router and why is it used?
What is React.memo and when should you use it?
What is code splitting in React?
When would you choose Context API over Redux?
What are Error Boundaries in React?
What are Custom Hooks in React?
What are Synthetic Events in React?
What is React.lazy and Suspense?
What is Server-Side Rendering (SSR) in React?
What are React Portals?
What is Concurrent Rendering in React?
What is Lifting State Up in React?
What is a Higher-Order Component (HOC)?
What is React.StrictMode?
What is React.Fragment and why would you use it?
What is useReducer and when should you use it?
What is Hydration in React?
What is Prop Drilling and how can it be avoided?
What is Conditional Rendering in React?
What is the purpose of the dependency array in useEffect?
Frequently Asked Questions
What is the primary role of React?
React is a component-based frontend library for building highly interactive user interfaces.
Is React 19 backward compatible?
Yes, React 19 keeps backward compatibility for class components while introducing automated compilers.
Related Blogs
Mastering React Context API for State Management
Context API is a powerful built-in tool for managing global state in React apps. Learn when to use it, how to structure it, and how to avoid common performance pitfalls.
Building Custom React Hooks That Actually Save Time
Custom hooks are the best way to share logic across components in React. Learn how to build reusable hooks for fetching data, form handling, debouncing, and more.
React 19 New Features You Need to Know in 2026
React 19 brings powerful new features like Actions, useOptimistic, and the new compiler. Learn how these changes can make your React apps faster and easier to build.
React Virtual DOM Explained: How React Updates the UI
Learn how React Virtual DOM works behind the scenes and why it improves application performance.